论文标题
VI $ _3 $的精制磁结构
Refined magnetic structure of VI$_3$
论文作者
论文摘要
van der waals Ferromagnet（FM），VI $ _3 $，由Muon自旋松弛（$μ^+$ SR）研究，并基于密度功能理论（DFT）进行了第一个原理计算。依赖温度的零场隆隆旋转松弛（$μ^+$ sr）的测量确认了远程FM顺序的开始，时间光谱显示出$ t <t _ {\ rm c} = 50.03（1）$ 〜k的时间光谱。基于中子衍射的已建立的磁性结构，在预测的万能位点计算出的内部磁场与测得的磁场不一致。这种不一致的原因是由于使用$μ^+$ sr和dft的组合研究得出了元素V和更准确的元素的强烈不连贯的中子散射和吸收。这些结果表明，轨道角动量的强烈贡献，为在Vi $ _3 $中存在v $^{3+} $的未淬灭的轨道角动量提供了实验证据。最后，在$ t _ {\ rm c} $上方存在一种短距离排序的不寻常形式。它的温度依赖性与以前在其他分层化合物中报道的病例不同，并讨论了其微观起源。
The van der Waals ferromagnet (FM), VI$_3$, was studied by muon spin relaxation ($μ^+$SR) and first principle calculations based on density functional theory (DFT). Temperature dependent zero field muon spin relaxation ($μ^+$SR) measurements confirm the onset of long range FM order and the time spectra exhibits clear muon spin precession frequencies for $T<T_{\rm C}=50.03(1)$~K. The calculated internal magnetic fields at the predicted muon sites, based on the established magnetic structure from neutron diffraction, is inconsistent with the measured one. This inconsistency is because of strong incoherent neutron scattering and absorption originating from the elements V and I. Instead, a new and a more accurate magnetic structure is derived based on a combined study using $μ^+$SR and DFT. These results suggest strong contritions from orbital angular momentum, providing experimental evidence for the existence of unquenched orbital angular momentum of V$^{3+}$ in VI$_3$. Finally, an unusual form of a short range ordering is present above $T_{\rm C}$. Its temperature dependence is unlike previously reported cases in other layered compounds and its microscopic origin is discussed.
